Cardiac perforation with intramural deposition of contrast agent is a severe com-plication of selective angiocardiography.
心脏穿孔和壁间造影剂沉积是选择性心血管造影严重并发症之一。
METHODS: Selective cerebral hypothermia is taken as a positive contrast.
方法：以选择性头部低温为阳性对照。
A new type of high contrast filter has been investigated in this paper. lt has features of lower light reflection on surface, selective transmission and effective electromagnetic screen.
本文介绍自行研制的高对比度滤光片。它具有较低的表面光反射率、选择性透过率和电磁屏蔽特性。
By contrast, an index that is not selective is not as useful.
与之相比，选择性低的索引就不那么有用了。
By contrast, an index that is not selective is not as useful.
与之相比，选择性低的索引就不那么有用了。
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